Yes, the Wholesale Order Form app supports Shopify Markets partially. Shopify Markets is a tool that helps merchants set up international markets with different currencies and languages.
With minimal documentation on Shopify Markets from Shopify, we can offer its multi-currency and International pricing support with the Wholesale Order Form as of now. We also hope to offer multiple languages support once Shopify Markets will release for all the merchants.
You do not require any integration to make Shopify Markets work with the Wholesale Order Form. It offers a URL-based approach and if Shopify Market is set from the settings, your customers will see the prices based on their region.
Note: when you add a Wholesale Order Form link to the menu bar, URL should be like /apps/shop and not yourstorename.myshopify.com/apps/shop.
Please refer to the below article: